As of January 26, 2021, the U.S. Centers for Disease Control and Prevention ("CDC") is requiring all air passengers entering the United States to present a negative COVID-19 test (a viral detection test for SARS-CoV-2 approved or authorized by the relevant national authority), taken within 72 hours of departure.
Airlines must confirm the negative test result for all passengers before boarding. Airlines must deny boarding of passengers if they do not provide documentation of a negative test or recovery. This requirement is separate from the visa application process. Travelers holding a National Interest Exception also remain subject to all applicable pre-departure testing requirements.
For additional information on this requirement, please visit:
https://www.cdc.gov/media/releases/2021/s0112-negative-covid-19-air-passengers.html